#include <REGX52.H>
#include <INTRINS.h>
void Delay(unsigned int xms)	 //@12.000MHz 
{
	unsigned char i, j;
	while(xms--){
		i = 2;
	  j = 239;
	do
	{
		while (--j);
	} while (--i);
	}
}
void main()
{
		unsigned cahr LEDNum = 0;//
		while(1)
		{
			if(P3_1==0)
			{
			Delay(20);
			while(P3_1==0);
			Delay(20);
			//P2端口默认上电1111 1111
			//P2++; 0000 0000
			//P2=~P2; 1111 1111
			LEDNum++;
			P2 = ~LEDNum;
			}
		}

}